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Proof step 3 from proof junkref-newref (previous step)

newref(r, st) ⊦ r = jvmref, ∃ refs. refs ≠ [] ∧ refs .first = r ∧ junkrefs(str, refs, st[r -- _type] .type, st)

User applied rule exists right

And obtained the following new goals

Proof step 2:
⊦ newref(r, st) → junkrefs(str, r ', ty, st)

Rule argument

[EXRARG : pos: right 2, [extquanttermlist: (r ')abort:F, discard:T, computed:F]]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ r ' ≠ []], [CSIMPSEQ : ⊦ r ' .first = r])], [EXTRATERMS : (r ')]]